The value of RTH between terminals A and B of the given circuit is 70 Ω.
While calculating the Thevenin resistance, voltage and current sources are replaced by their internal resistances.
RTH between terminals A and B is-
100 Ω and 68 Ω resistances are in series,
120 Ω and (100 Ω and 68 Ω) are in parallel.
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